About 24 million years ago, the baby animals of the giant beast are called ancestors. Megalodon A place is needed to grow up before moving to the new seas, so they roam a coastal location with easy-to-catch prey – which is now a nursery in South Carolina, according to new research.
Until now, scientists knew only two fossil shark nurseries: 10 million years old Megalodon Nursery Another 5 million years in Panama Great White Shark Nursery in Chile. In addition to being the third such nursery, the new nursery is also the first nursery to record Karchokles Angstidens, The smallest shark that lived during Oligosine era (34 million to 23 million years ago), said co-researcher Robert Bosenecker, a research fellow at the Mess Brown Museum of Natural History at the College of Charleston in South Carolina.
When Bosenaker and his colleague examined the teeth of a shark from the nursery site, they got another surprise; It came from the biggest C. Angsteads On record, according to an equation that calculates the length of a shark’s body based on the size of its teeth. The new estimate changes the understanding of how big these ancient carnivores can be.
Earlier, the record holder was from a C. Angsteads Teeth found in new zealand, Which now places extinct sharks at a maximum length of 27.8 feet (8.47 m). “The maximum length for our recalculation C. Angsteads Is 8.85 m [29 feet]”, Said co-researcher Edison Miller, who graduated in geology from the College of Charleston in May. It was slightly larger than the New Zealand sample.”
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In comparison, modern great White shark (Carcharodon Carcharias) Can reach a length of 20 feet (6 m), but most are smaller, Live Science previously reported.
Research on shark teeth found in the nursery, which has not yet been published in a peer-reviewed journal, was presented online at the annual conference of Vertebrate Palaeontology on 13 October, which this year marks the COVID-19 The reason was virtual Universal epidemic.
The research “appears to be an ongoing work,” but claims it could be exciting to have a paleo-shark nursery, said Kenshu Shimada, a professor of paleontology at Densul University, who was not involved in the research, but who Learned in Project at the conference, told Live Science. If supported with more evidence, this finding “demonstrates that the behavioral and adaptive strategy of using nursery fields was already developed for the megatog shark lineage about 24 million years ago.”
Researchers primarily discovered shark teeth in a rock unit: the fossilized Chandler Bridge Formation in the city of Summerville, South Carolina. In total, researchers examined 87 C. Angustidens Dating from this to the tooth and neighboring Ashley Formation Late Oligosin.
Because these particular parts of the fossil formation were not picked up by amateur fossil collectors, shark teeth collected from these structures are believed to be an accurate representation of the sharks living there. This is important, because “everyone and their mom go out and dig shark teeth and sell them here”, in South Carolina, and people usually bear the biggest teeth they can find, Bosenacker said . This can cause headaches for paleontologists, who can find sites with too many small shark teeth (a sign of a shark nursery), which is not an accurate representation of the shark that lives there, as all large shark teeth first. Have been away from
To investigate, Miller analyzed teeth from two structures. With new maximum length for C. Angustidens, She was able to calculate ranges of estimated body sizes for baby sharks, juveniles, and adults. Then, using the tooth-to-body-length equations (there is a separate equation for each tooth, depending on its position in the mouth), he determined the body shape of the shark.
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In all, Miller found that 87 teeth, three (3%) were infants, 77 (89%) were juveniles and seven (8%) were adults. “The total length of our body was 4.8 meters [15.7 feet], Meaning it sounded like more and more C. Angustidens Nursery, ”Miller told Live Science in an email.
The Oligocene waters of South Carolina were also home to easily accessible hunting C. Angsteads, Including billfish, tuna, mackerel, chelenid sea turtles, leatherback sea turtles, dolphins, bellian whales, sea cows and other sharks and rays, Bosenene said. In addition, the location was a shallow area that provided natural protection to young sharks who were not prepared for life in the deep sea, he said.
Originally published on Live Science.